Have to rev to 3000 RPM to get vehicle to Move

Good day,

My ford vehicle required rpm 3000 to move off at d drive.

Once stop and require to move off needed RPM 3000 in order for the vehicle to move off.

I have tested with OBD2, the fault code shown 0732. Which is gear ration 2 incorrect.

Things I have done up,

1. Flush transmission system.
2. Blow clean the contact for the solenoid with contact cleaner.
3. Check the output shaft, turbine shaft and intermediate shaft sensor.


I wonder what when wrong with my transmission.

While ongoing it react normally but once the vehicle slow down, I need high rpm to move the vehicle again.

It also have a symptom of "TA" sound when moving off and it a bit scary and the rear wheel will spin while moving off.

Kindly assist me.